scholarly journals Design of Thermoelectric Starting Pre-Heater on Gas Fuel

2019 ◽  
Vol 19 (3) ◽  
pp. 270-278
Author(s):  
M.V. Maksymuk
Keyword(s):  
Computer Simulation ◽  
Physical Model ◽  
Mathematical Description ◽  
Electric Energy ◽  
Comsol Multiphysics ◽  
Software Environment ◽  
Thermoelectric Converter ◽  
Ambient Temperatures ◽  
Gas Fuel

This paper presents the results of computer simulation of thermoelectric starting pre-heater on liquefied gasfuel for easier starting of vehicle engines under low ambient temperatures. The physical model of the heater ispresented, its mathematical description is given, the method and results of calculations of the main energy andstructural characteristics of the device in the software environment "Comsol Multiphysics" are presented.It is shown that the use of the thermoelectric converter as a source of electric energy provides autonomousoperation of the heater components and allows solving the problem of discharging the vehicle battery during theoperation of the pre-start equipment.

Modelling of the Planar Aerostatic Two-Coordinate Relative Bases

2013 ◽  
Vol 198 ◽  
pp. 372-377 ◽  
Author(s):  
Tomasz Huścio ◽  
Franciszek Siemieniako
Keyword(s):  
Computer Simulation ◽  
Physical Model ◽  
Mathematical Description ◽  
Simulation Results ◽  
Coordinate Base

The paper describes the construction and the principle of operation of a planar aerostatic two-coordinate relative base. The physical model and the mathematical description of a planar aerostatic two-coordinate relative base are presented. Stages of the computer simulation of the planar aerostatic two-coordinate base and the computer simulation results are presented.

Static Model of a Rail Launcher

2009 ◽  
Vol 147-149 ◽  
pp. 456-461
Author(s):  
Zdzisław Gosiewski ◽  
Piotr Kłoskowski
Keyword(s):  
Computer Simulation ◽  
Magnetic Flux ◽  
Simulation Model ◽  
Flux Density ◽  
Mathematical Description ◽  
Static Model ◽  
Comsol Multiphysics ◽  
Magnetic Flux Density ◽  
Static State ◽  
Simulation Results

The paper presents the analytic and simulation model of the rail launcher in a static state. The force acting on the projectile and the magnetic flux density were investigated. The mathematical description of the force acting on the projectile was derived. The simulation model was build with help of the COMSOL Multiphysics software. The computer simulation results were compared with the results obtained in the analytic way.

scholarly journals Consideration of Solution for Enhancement of Frequency Converter Supply Power Parameters

2018 ◽  
Vol 55 (4) ◽  
pp. 24-34 ◽  
Author(s):  
I. Rankis ◽  
G. Zaleskis
Keyword(s):  
Computer Simulation ◽  
Power Factor ◽  
Mathematical Description ◽  
Frequency Converter ◽  
Phase Current ◽  
Front End ◽  
Dc Current

Abstract The paper presents results of analysis of a possible solution for enhancement of frequency converter (FC) AC supply power parameters. The method proposed is based on switched stabilisation of DC current of FC front-end rectifier unit. Such stabilisation allows obtaining rather good AC supply power parameters, i.e., its power factor and total harmonics distortion (THD) indicator for phase current. The paper also demonstrates a possible realisation scheme, a simplified mathematical description of processes in the scheme, as well as methods for consideration of its parameters, accounting the rated power of FC and the appointed level of the rectifier DC current continuity ratio. The results of computer simulation, to a great extent, testify a possible enhancement level.

Nonlinear Finite Element Analysis of Moving Coil Loudspeaker Suspension

2006 ◽  
Author(s):  
Naveen Viswanatha ◽  
Mark Avis ◽  
Moji Moatamedi
Keyword(s):  
Finite Element Analysis ◽  
Computer Simulation ◽  
Finite Element ◽  
Physical Model ◽  
Cost Effective ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Element Analysis ◽  
Sinusoidal Load ◽  
Geometric Effects

The surround and the spider of the loudspeaker suspension are modelled in ANSYS to carry out finite element analysis. The displacement dependent nonlinearities arising from the suspension are studied and the material and geometric effects leading to the nonlinearities are parameterised. The ANSYS models are simulated to be excited by a sinusoidal load and the results are evaluated by comparison with the results obtained by a physical model. The paper illustrates how practical models can be analysed using cost effective finite element models and also the extension of the models to experiment on various parameters, like changing the geometry for optimisation, by computer simulation.

scholarly journals Building a physical model of acoustic air pollution reduction process for brick manufacturing enterprises

2020 ◽  
Vol 164 ◽  
pp. 01011
Author(s):  
Vadim Bespalov ◽  
Oksana Gurova ◽  
Valeriya Baklakova
Keyword(s):  
Air Pollution ◽  
Physical Model ◽  
Mathematical Description ◽  
Physical Modeling ◽  
Reduction Process ◽  
Energy Approach ◽  
Pollution Reduction ◽  
Dispersed Systems ◽  
Manufacturing Enterprises

The article is devoted to the study of the air acoustic pollution reduction process for brick manufacturing enterprises based on the physical and energy approach based on the theory of dispersed systems. The authors performed physical modeling of the process taking into account the properties of all the objects taking part in it at each stage and the features of the space in which it is implemented. Based on the constructed model, a mathematical description of the probability of the process and its effectiveness is obtained.

Identification of Rayleigh-Bénard Convection on Physical Model of Electric Furnace

2008 ◽  
Vol 39-40 ◽  
pp. 481-484
Author(s):  
Antonín Lisý ◽  
Josef Smrček
Keyword(s):  
Physical Model ◽  
Convective Flow ◽  
Electric Energy ◽  
Melting Furnace ◽  
Melting Tank ◽  
Bénard Convection ◽  
Reducing Ability ◽  
Benard Convection ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

The released electric energy in the melting tank, the distribution of temperatures in the glass melt and by them generated the flow influences a quality of the manufactured glass melt especially their homogeneity. Between those places where the energy releases and where the energy consumes generates natural convection, called Rayleigh-Bénard convection. This type of the convective flow is forming by the volumetric releasing of energy and this flow is also present in electric glass melting furnaces. In the melting tank of the furnace is released energy transported to colder areas for heating and melting of the batch. Experiments on the physical model were carried out with cooling the surface and heating the room below it. The temperature gradient area rises in the horizontal layer below the batch. From this layer the cooler blobs divide off and fall. Theirs velocities are depended on RaI 0,33 and it is less than the dependence of the flow velocity measured by Dubois and Bergé with RaI 0,50. The results of the electric energy releasing in the physical model of the melting furnace showed that with decreasing depth of the tank is forming more smaller cells of Rayleigh-Bénard convective flow and also by them is reducing ability of the blobs flow generating.

scholarly journals Study of CPM Device used for Rehabilitation and Effective Pain Management Following Knee Alloplasty

2017 ◽  
Vol 22 (1) ◽  
pp. 241-251 ◽  
Author(s):  
R. Trochimczuk ◽  
T. Kuźmierowski ◽  
P. Anchimiuk
Keyword(s):  
Computer Simulation ◽  
Pain Management ◽  
Computer Simulations ◽  
Control Strategy ◽  
Virtual Model ◽  
Software Environment ◽  
Motion Parameters ◽  
Anatomical Atlas ◽  
Laboratory Prototype ◽  
Selection Of

Abstract This paper defines the design assumptions for the construction of an original demonstration of a CPM device, based on which a solid virtual model will be created in a CAD software environment. The overall dimensions and other input parameters for the design were determined for the entire patient population according to an anatomical atlas of human measures. The medical and physiotherapeutic community were also consulted with respect to the proposed engineering solutions. The virtual model of the CPM device that will be created will be used for computer simulations of changes in motion parameters as a function of time, accounting for loads and static states. The results obtained from computer simulation will be used to confirm the correctness of the design adopted assumptions and of the accepted structure of the CPM mechanism, and potentially to introduce necessary corrections. They will also provide a basis for the development of a control strategy for the laboratory prototype and for the selection of the strategy of the patient's rehabilitation in the future. This paper will be supplemented with identification of directions of further research.

scholarly journals Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5663
Author(s):  
Luca Viscito ◽  
Gianluca Lillo ◽  
Giovanni Napoli ◽  
Alfonso William Mauro
Keyword(s):  
Waste Heat ◽  
Cooling System ◽  
Electric Energy ◽  
Cost Evaluation ◽  
Low Grade ◽  
Ambient Temperatures ◽  
Partial Load ◽  
Seasonal Performance ◽  
Ejector System ◽  
Break Even Point

In this paper, a seasonal performance analysis of a hybrid ejector cooling system is carried-out, by considering a multi-ejector pack as expansion device. A 20 kW ejector-based chiller was sized to obtain the optimal tradeoff between performance and investment costs. The seasonal performance of the proposed solution was then evaluated through a dynamic simulation able to obtain the performance of the designed chiller with variable ambient temperatures for three different reference climates. The optimized multi-ejector system required three or four ejectors for any reference climate and was able to enhance the system performance at partial load, with a significant increase (up to 107%) of the seasonal energy efficiency ratio. The proposed system was then compared to conventional cooling technologies supplied by electric energy (electrical chillers EHP) or low-grade heat sources (absorption chillers AHP) by considering the total costs for a lifetime of 20 years and electric energy-specific costs for domestic applications from 0.10 to 0.50 €/kWhel. The optimized multi-ejector cooling system presented a significant convenience with respect to both conventional technologies. For warmer climates and with high electricity costs, the minimum lifetime for the multi-ejector system to achieve the economic break-even point could be as low as 1.9 years.

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